Torsional Response of Continuous Thin Walled Box Girder Structures

摘要

This work considers the interactive response of continuous thin-walled box structures in pure and warping torsion. The derivation of the torsional equilibrium eq uation commenced on the basis of Vlasov's stress displacement relations by the variational approach. The existing equation due to St. Venant's classical torsion theory in which the torsional constants was based on the independent summation of the combined torsional stresses was compared with the derived equation b y Osadebe which took into consideration the interactive effect of pure and warping torsion. Closed form expressions that explicitly described the torsional stresses along beam was developed. The results of the comparative analysis based on the numerical analysis using the method of initial value approach further revealed that the present equation based on the interactive effect of the co mbined torsional states generates a significant effect on torsional rigidity with greater contribution fro m the internal concentrated torque, giving rise to higher stresses